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A low water peak large-size optical fiber preform and its manufacturing method

A technology of optical fiber preform and manufacturing method, which is applied in the direction of manufacturing tools, glass manufacturing equipment, glass fiber products, etc., can solve the problems of increasing optical fiber attenuation, high hydroxyl content, limiting the use of optical fibers, etc., to reduce concentricity errors, reduce Effect of attenuation and loss reduction

Active Publication Date: 2021-09-03
JIANGSU ETERN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydroxyl content prepared by the continuous melting method is high. In order to reduce the hydroxyl content of the continuous fused quartz sleeve, the inner diameter of the sleeve is much larger than that of the sleeve prepared by other processes, which requires the preparation of a larger diameter prefabricated core rod. It is difficult to match it, but even if the inner diameter of the casing is increased, the hydroxyl content is still high
However, in optical fiber transmission, due to the existence of absorption peaks (called water peaks) of hydroxyl (OH) in the range of 1360nm to 1460nm, this will increase the attenuation of optical fibers and limit the use of optical fibers in this window

Method used

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  • A low water peak large-size optical fiber preform and its manufacturing method
  • A low water peak large-size optical fiber preform and its manufacturing method
  • A low water peak large-size optical fiber preform and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The solid prefabricated mandrel is prepared by MCVD process: firstly, the fluorine-doped quartz tube is heated to 600 ° C, and SF6 gas is introduced into the fluorine-doped quartz tube to chemically etch the inner surface of the base tube to remove impurities on the inner surface of the fluorine-doped quartz tube. The relative refractive index of the fluorine-doped quartz tube is Δn 1 =-0.32%; secondly, at 1950 ° C, deposit an inner cladding layer on the inner wall of the fluorine-doped quartz tube, and in the reaction gas silicon tetrachloride and oxygen, pass a fluorine-containing gas (SiF 4 ) and germanium tetrachloride to form a GeO2-F co-doped inner cladding, and the relative refractive index of the inner cladding is Δn 2 =0.01%, where the doping contribution of Ge is Δn Ge The core layer was deposited on the inner cladding layer at 1700°C, and fluorine-containing gas (SiF) was introduced into the reaction gas silicon tetrachloride and oxygen 4 ) and phosphorus o...

Embodiment 2

[0041] The solid prefabricated mandrel is prepared by MCVD process: first, the fluorine-doped quartz tube is heated to 700°C, and SF6 gas is introduced into the fluorine-doped quartz tube to chemically etch the inner surface of the substrate tube to remove impurities on the inner surface of the fluorine-doped quartz tube. The relative refractive index of the fluorine-doped quartz tube is Δn 1 =-0.45%; followed by depositing an inner cladding on the inner wall of the fluorine-doped quartz tube at 2000°C, and feeding a fluorine-containing gas (SiF 4 ) and germanium tetrachloride to form an inner cladding layer co-doped with GeO2-F, and the relative refractive index of the inner cladding layer is △n 2 =0.02%, where Ge doping contribution Δn Ge 0.05%; finally at 1800°C, deposit a core layer on the inner cladding layer, and in the reaction gas silicon tetrachloride and oxygen, pass a fluorine-containing gas (SiF 4 ) and phosphorus oxychloride to form P 2 O 5 -F co-doped core la...

Embodiment 3

[0045] The solid prefabricated mandrel is prepared by MCVD process: firstly, the fluorine-doped quartz tube is heated to 550°C, and SF6 gas is introduced into the fluorine-doped quartz tube to chemically etch the inner surface of the substrate tube to remove impurities on the inner surface of the fluorine-doped quartz tube. The relative refractive index of the fluorine-doped quartz tube is Δn 1 =-0.12%; Next, at 1850°C, the inner cladding is deposited on the inner wall of the fluorine-doped quartz tube, and the fluorine-containing gas (SiF 4 ) and germanium tetrachloride to form an inner cladding layer co-doped with GeO2-F, and the relative refractive index of the inner cladding layer is △n 2 =-0.02%, where Ge doping contribution Δn Ge 0.01%; Finally, at 1650°C, deposit a core layer on the inner cladding layer, and in the reaction gas silicon tetrachloride and oxygen, pass a fluorine-containing gas (SiF 4 ) and phosphorus oxychloride to form P 2 O 5 -F co-doped core layer,...

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Abstract

The invention relates to a low water peak and large-size optical fiber preform and a manufacturing method thereof. The manufacturing method is as follows: using an MCVD process to successively deposit an inner cladding layer and a core layer on the inner wall of a fluorine-doped quartz tube as a lower limit layer to obtain a deposition tube, and The deposition tube is melted and shrunk to obtain a solid prefabricated core rod with a core layer, an inner cladding layer and a sunken layer; the outer cladding loose body is deposited on the outside of the solid prefabricated core rod by the OVD process, and then sintered to obtain a composite core rod; the RIC process is used to The synthetic core rod and the continuous fused silica sleeve are combined to form a low water peak large-size optical fiber preform. The diameter of the optical fiber preform prepared by the present invention can reach 230mm, and the fiber drawing length of a single preform can reach 3300km. Attenuation coefficient ≤ 0.175dB / km.

Description

technical field [0001] The invention relates to a low-water peak large-size optical fiber preform and a manufacturing method thereof, and belongs to the field of optical fiber preform manufacturing. Background technique [0002] At present, the process of producing optical fiber preforms mainly adopts a two-step method, that is, first manufacturing the preform core rod, and then manufacturing the cladding outside the core rod. There are four typical mandrel fabrication techniques: Modified Chemical Vapor Deposition (MCVD), Microwave Plasma Chemical Vapor Deposition (PCVD), External Vapor Deposition (OVD) and Axial Vapor Deposition (VAD) , The manufacturing technology of the outer layer mainly includes the casing method, the outer deposition method, and the plasma spraying method. [0003] At present, the main domestic supply of casing is imported. Some domestic manufacturers have used the continuous melting method to prepare fused silica casing, which is expected to break t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/018C03B37/012C03B37/027
CPCC03B37/01211C03B37/018C03B37/01853C03B2203/32
Inventor 李想莫思铭李凡张国栋周莉
Owner JIANGSU ETERN
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